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Hi Heiko,

The general way to take down an XRootD data server is to simply kill it. 
You are correct, you need to kill the corresponding cmsd if the server was 
in a cluster. The only thing you need to watch out for is that you may 
have some kind of auto-restart facility (usually true in k8 deployments) 
that will simply undo what you did with the kill. So, make sure the server 
will not be auto-restarted.

The next thing is that the redirector will remember the server for 10 
minutes. This is simply because it thinks that maybe it will come back 
(usually the case but not for you). All this means is that if a client 
tries to access a file that only existed on the shutdown server the 
redirector will ask te client to wait until the server comes back up 
(which it won't). But notice this is a benign action since if that server 
was the only one that had the file then the only other alternative is to 
give the client a "not found" error which would terminated the client. So, 
it only delays enevitable death by 10 minutes.

Andy

On Wed, 12 Jun 2019, schroete wrote:

> Hello,
>
>
> i've been struggling with the proper way of taking an xrootd node (aka raid 
> server) out of service because of aging disks.
>
> I shutdown the xrootd/cmsd process of this raid.
>
> But then it takes a very long time (tens of minutes or never) to make the 
> remaining xrootd cluster visible/accessible again on the clients.
>
> Sometimes a reboot of client helps but not always.
>
> Restarting the services on the xrootd command node does not help.
>
>
> So what is the correct procedure to takedown a xrootd server node ?
>
>
> Regards
>
> Heiko
>
>
>
> -- 
> -----------------------------------------------------------------------
> Dipl.-Ing. Heiko Schröter
> Institute of Environmental Physics (IUP)   phone: ++49-(0)421-218-62092
> Institute of Remote Sensing (IFE)          fax:   ++49-(0)421-218-62070
> University of Bremen (FB1)
> P.O. Box 330440               email:  [log in to unmask]
> Otto-Hahn-Allee 1
> 28359 Bremen
> Germany
> -----------------------------------------------------------------------
>
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